How can i make mu dog stop farting?

I have two problems one i need to get my dog to stop farting. He is making my eyes water. The vet s lbs. black lab and boxer mix one that doesn't make him fart. I have tried eight different kinds and i cant take it any more any suggestions how how yo help please let me no. The other is when he does fart he scares himself and looks at his but like it was going to bit him wines and runs out of the room. Is this normal?